Health
The Wonder Weeks Summary & Review: Fussy Weeks Are Leaps, Not Crises
The Wonder Weeks maps ten fussy leaps in a baby's first 20 months. Treat clingy weeks as development, not a broken baby…
Read Summary →Frans X. Plooij
"Stormy week, then a new world."
Frans X. Plooij is a Dutch behavioural biologist and developmental psychologist. He took his Ph.D. at Groningen on chimpanzee infancy, worked at Gombe with Jane Goodall, and with Hetty van de Rijt wrote The Wonder Weeks — later editions with their daughter Xaviera Plas-Plooij.
1 book·Infant leaps, ethology & parent maps
Books by Frans X. Plooij
Our in-depth summaries and reviews of his work
Key Ideas & Recurring Themes
Fussy weeks are leaps
Clingy plus cranky is often a new world coming online, not a broken routine.
Count from the due date
Leap windows start at conception. Birthday is a noisy clock.
Notable Quotes
"Why is my baby cranky, clingy, and crying?"— The Wonder Weeks, sixth edition framing question
Book Author Frans X. Plooij
The Wonder Weeks Summary & Review: Fussy Weeks Are Leaps, Not Crises
The Wonder Weeks maps ten fussy leaps in a baby's first 20 months. Treat clingy weeks as development, not a broken baby — then play the new world.